Question

with the help of mobile phone find the names of cities in various countries which are ahead or behind the Greenwich line​

Answer 1

Answer:

Hy mate here is your answer

Greenwich Mean Time (GMT) is the meansolar time at the Royal Observatory in Greenwich, London, reckoned from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon;[1] as a consequence, it cannot be used to specify a precise time unless a context is given.

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Answer 2

just go to clock in your default apps and click world clocks option and find for yourself